That is the 40-47 cab style. The 40-41 are slightly different where the front fenders bolted on and would still have a single cross spring in front. The 42-47 used parallel front leafs, if the chassis is even original. It appears someone has hung pedals as it has a firewall master cylinder.
Who named your program, the pentagon?
P.S. if you need any bits and pieces for the cab I have a little stuff around from junking one.